If you're in the mad scramble to patch the Heartbleed vulnerability in OpenSSL on your Ubuntu servers but you need to see some documentation, look in your /usr/share/doc/openssl/changelog.Debian.gz file. If you see the following at the very top of the file, you're patched:

If you don't, run sudo apt-get update followed by sudo apt-get upgrade -y and then reboot the machine to make sure everything linked against OpenSSL gets restarted and uses the new code. Better safe than sorry.